The right payload bay door of Discovery is being closed in preparation for the rollover of the orbiter to the Vehicle Assembly Building.

In the Orbiter Processing Facility, the right payload bay door of Discovery is being closed in preparation for the rollover of the orbiter to the Vehicle Assembly Building. The primary payload, the U.S. Node 2, which is named Harmony, will be installed in the payload bay at the pad prior to Discovery's liftoff on mission STS-120. The mission will be the 23rd flight for the assembly of the International Space Station. Space Shuttle Discovery is targeted for launch on Oct. 23. Photo credit: NASA/Jim Grossmann